feat!: extend the available styles for mode by separating mode from the separator styles

[sxyazi]

An implementation of the feature request: #732, #1228

Closes #732, #1228

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Previously, only a single mode style was supported, which meant the same mode style was used for both the highlight and secondary colors, and the separator style was applied to the secondary color.

This led to the inability to set different styles for the primary color of the mode, and users couldn't control the mode style independently because it depended on the separator style.

This PR separates the mode from the separator style, making it its own distinct style. Users will now be able to set different main and alternate styles for each of the 3 modes individually.

⚠️ Breaking changes

mode_normal, mode_select, mode_unset, and separator_style have been separated into a new, independent [mode] section:

• normal_main - Main style for the normal mode
• normal_alt - Alternate style for the normal mode
• select_main - Main style for the select mode
• select_alt - Alternate style for the select mode
• unset_main - Main style for the unset mode
• unset_alt - Alternate style for the unset mode

permissions_t, permissions_r, permissions_w, permissions_x, and permissions_s have been renamed to perm_type, perm_read, perm_write, perm_exec, and perm_sep to improve readability and align with the naming conventions in #1761.

[boydaihungst]

I noticed you changed theme.toml to theme-base.toml. I tried changing it to theme-base.toml as well, but only theme.toml works. Is this a bug, or are we still using theme.toml?

[sxyazi]

User config file is always theme.toml and unchanged:

yazi/yazi-config/preset/theme-base.toml

Lines 1 to 3 in 5e48df5

	# If the user's terminal is in dark mode, Yazi will use the content from `theme-base.toml` + `theme+dark.toml` as the default theme;
	# if it's in light mode, use `theme-base.toml` + `theme+light.toml` instead.
	# Users can always override and adjust the default theme in their own `theme.toml` configuration file.

[asim215]

@sxyazi Thank you, for your effort to implement this! I appreciate it. 👍 ❤️